Kushner's lawyer, Abbe Lowell, told CNN that Kushner is cooperating with the special counsel's investigation of possible collusion between Trump campaign staff and Russia during the 2016 presidential election.

"Mr. Kushner has voluntarily cooperated with all relevant inquiries and will continue to do so," Lowell said.

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According to the report, Kushner spoke with the team for less than 90 minutes, and was asked specifically about Flynn. Other details about the meeting or of possible future meetings between the two sides were not immediately made known.

Flynn is reportedly under investigation for an alleged quid pro quo deal with Turkey's government, in which Flynn would have been paid millions of dollars in exchange for the extradition of an exiled Muslim cleric living in the U.S. whom Turkey's president suspects was involved in a 2016 coup attempt.

Federal records also show that the former national security adviser did not register $530,000 he was paid last year for work he did that the Justice Department said principally benefited Turkey, which is a potential violation of the Foreign Agents Registration Act.

Speculation has grown in recent weeks over whether Mueller has “flipped” Flynn, convincing him to act as an informant on bigger fish in the special counsel’s investigation into Russian meddling in the U.S. presidential election.

Both Kushner and Donald Trump Jr. have also come under scrutiny for meeting during the campaign with a Russian lawyer who claimed to have damaging information about Hillary Clinton.

Senate Judiciary Committee Chairman Chuck Grassley (R-Iowa) and ranking member Dianne Feinstein (D-Calif.) sent a letter earlier this month to Lowell demanding additional documents from Kushner as part of the committee’s investigation into Russian meddling in the 2016 election.

In the letter, the two senators said Kushner received and forwarded emails about WikiLeaks, as well as a communication about a “Russian backdoor overture and dinner invite.” Kushner was originally given a deadline of Nov. 27 to turn over relevant documents.